Occultation event with (13385) 98XO79, event index number 872
Regions able to see the event: Australia
Geocentric closest approach at 2025/04/01 14:27:30 UTC
J2000 position of star is 09:06:52.3 +12:46:46
Equinox of date position of star is 09:08:15.1 +12:40:36
Star is 79 degrees from the moon. Moon is 14% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=16.5
Use an exposure time of 1.45 seconds with the standard RECON-QHY system.
Expected flux drop is 43% with SNR of 5.2 per integration
Apparent velocity is 6.6 km/sec on the sky relative to the star, or, 6.7 arcsec/hr.
The recommended exposure time corresponds to 9.5 km per image.
The 1-sigma error in the time of the event is 5.0 seconds.
The 1-sigma cross-track error in the shadow position is 58.4 km.
The sky-plane scale is 3521.0 km/arcsec.
Diameter estimates:
38.7 km assuming a 5% albedo, aximum of 5.9 sec for a central chord
15.8 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 38.7 km used for deployment plan.
Star training set for 13385_98XO79, (2025/04/01 14:27UT) Object RA Dec mag sep mel Regulus 10:09:42.8 +11:50:34 1.3 15.04 93 76Kap Cnc 09:09:06.7 +10:33:54 5.2 2.12 80 PPM 126082 09:06:21.2 +13:14:31 8.2 0.73 79 PPM 126132 09:09:02.4 +12:37:24 9.8 0.20 80 PPM 126120 09:08:18.8 +12:36:19 10.1 0.07 79 13385_98XO79 09:08:15.1 +12:40:36 16.5 80 Positions are for equinox of date
Star training set for 13385_98XO79, (2025/04/01 14:27UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 15.04 93 76Kap Cnc 09:07:44.8 +10:40:05 5.2 2.12 80 PPM 126082 09:04:58.1 +13:20:37 8.2 0.73 79 PPM 126132 09:07:39.6 +12:43:34 9.8 0.20 80 PPM 126120 09:06:55.9 +12:42:28 10.1 0.07 79 13385_98XO79 09:06:52.3 +12:46:46 16.5 79 Positions are for J2000